Fastener applying tool and power unit therefor



Sept. 4, 1962 G. J. VAN HEcKE FASTENER APPLYING TOOL AND POWER UNITTHEREFOR Filed April 18, 1958 5 Sheets-Sheet 1 e. 2S. O/MW me N EH M M,i f, e @Y MB /J/ w L d l y Sept. 4, 1962 G. J. VAN HECKE 3,052,099

FASTENER APPLYING TooL AND POWER UNT THEREFOR Filed April 18, 1958 5Sheets-Sheet 2 INVENTOR.

E@ fm Sept' 4, 1962 G. J. VAN HECKE 3,052,099

FASTENER APPLYING TOOL ND POWER UNIT THEREFOR Filed April 18, 1958 5Sheets-Sheet 3 INVENTOR. @607e .f' l/arr Hee/fe.

Sept- 4, 1962 G. J. VAN HECKE 3,052,099

FASTENER APPLYING TOOL AND POWER UNIT THEREF'OR Filed April 18, 1958 5Shee'cs-SheecI 4 INVENTOR. @Gaye j' [Q77 #9c/ge.

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Sept. 4, 1962 G. J. VAN HECKE FASTENER APPLYING TooL AND POWER UNITTHEREFOR Filed April 18, 1958 5 Sheets-Sheet 5 ,ffii

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INVENTOR. )QW Hee/fc BY fr United ,t States Patent Oilce 3,052,099Patented Sept. 4, 1962 3,052,099 FASTENER APPLYING T001. AND PWER UNITTHEREFR George J. Van Hecke, Detroit, Mich., assigner to HuckManufacturing Company, Benoit, Mich., a corporation of Michigan FiledApr. 1S, 1958, Ser. No. '729,349 13 Ciaims. (Ci. 60--S4.5)

This invention relates generally to mechanisms for applying fastenersand more particularly to a fastener applying tool and a hydraulic powerunit for a fastener drivmg tool.

The fastener applying tools of the type to which this invention relatesare fluid operated and are for driving fasteners of types such as theones having a pin and a collar which is cold-swaged tightly into lockinggrooves in the pin. Each tool, therefore, includes an anvil enga geablewith the collar and a multiple jaw assembly engageable with pullinggrooves on the pin. Either the anvil, the jaw assembly, or both parts,are moved so as to provide for a -relative movement of the parts inopposite directions. The structure for accomplishing this relativemovement includes a cylinder formed in the gun and a piston mounted inthe cylinder for reciprocal movement. On movement of the piston in onedirection, the tool anvil and jaw assembly are moved relative to eachvother to provide :for driving of the fastener. The piston is then movedin an opposite direction to return the anvil and the jaw assembly torelative Apositions in which the tool is set for another drivingoperation.

In the tools now in use commercially, the structure for reversing thedirection of travel of the piston consists of a valve mechanismassembled in the driving tool. Such a tool is, therefore7 complex,heavy, and subject to mechanical mis-adjustments. Furthermore, since theoperators of such tools are usually not capable of correctly adjustingthe tools, additional difficulty is caused by unnecessary and improperoperator adjustments.

An object of this invention, therefore, is to provide a power unit anddriving tool assembly in which the necessary valve mechanism forreversing the direction of travel of the tool piston is incorporated ina unit which is remote from the tool so that the tool is of a simplifiedconstruction and is of light weight.

A further object of this invention is to provide an improved fastenerapplying tool which is of a simplied construction.

Another object of this invention is to provide a power unit whichincludes an auxiliary uid chamber that is expansible for receivingadditional fluid when the fluid pressure in the tool is above apredetermined pressure required for tool operation, with the auxiliaryfluid chamber being also contractible to supply make-up fluid to thesesame passages when leakage has reduced the Volume of fluid therein.

A further object of this invention is to provide a power unit for afastener driving tool which is simple in construction, economical tomanufacture, `and efcient in operation in providing the necessary uidpressures for operating the tool.

Further objects, features and advantages of this invention will becomeapparent from a consideration of the following description, the appendedclaims and the accompanying drawing in which:

FIGURE l is a vertical sectional view of the power unit of thisinvention, looking substantially along the line 1-1 in FIG. 2;

FIG. 2 is a top view of the power unit of this invention, with parts ofthe handle therefor broken away;

FIG. 3 is a horizontal sectional View looking substantially along theline 3 3 in FIG. 1;

FIGS. 4 and 5 are fragmentary enlarged sectional views looking along thelines 4-4 and 5--5 in FIG. 2;

FIG. 6 is a horizontal sectional view looking along the line 6-6 in FIG.l;

FIG. 7 is a fragmentary side elevational view of a lower portion of thepower unit of this invention;

FIG. 8 is a horizontal sectional view looking substantially along theline 8 8 in FIG. l;

FIGS. 9 and l0 are enlarged fragmentary sectional views looking alongthe lines 9-9 and 11i-1G in FIG. 2;

FIG. 11 is a wiring diagram showing the circuit for the switches and thevalve operating solenoid in the power unit of this invention;

FIG. 12 is a side elevational view of a driving tool adapted to be usedwith the power unit shown in FIG. 1 with some parts broken away andother parts shown in section for the purpose of clarity;

FIG. 13 is a fragmentary sectional View looking along the line 13-13 inFIG. 12;

FIG. 14 is a side elevational view of another driving tool adapted to beused with the power unit shown in FIG. 1, with some parts broken awayand other parts shown in section for the purpose of clarity;

FIG. 15 is a fragmentary sectional view as seen along the line 15-15 inFIG. 14.

FIG. 16 is a fragmentary plan View of the barrel portion of the toolshown in FIG. 14, with some parts broken away for the purpose ofclarity; and

FIG. 17 is a fragmentary elevational view of a portion of the tool shownin FIG. 14.

With reference to the drawing, the power unit of this invention,indicated generally at 10, is illustrated in FIG. l as including a base12 which carries an upwardly extending cylinder member 14. An uprightreservoir member 16 is mounted on the upper end of the cylinder member14. A. cap or cover Ztl, for the reservoir 16, also acts to secure `ahorizontal exible diaphragm 18 lto the reservoir 16. Upright connectingbolts 2.2` extend between the base 12 and the cover 20t for holding thecylinder member 14, the reservoir member 1.6 and the cover member Ztl inpositions extending upwardly on the base 12. A tubular handle member214, of circular shape, is secured by bolts 2,6 to the cover member 2i)`which has an upwardly extending bearing portion 26a which slidablysupports a tubular stem 23 secured vat its lower end to a centralportion of the diaphragm 18. At its upper end the stem 211i carries acollar 27 having a depending annular flange 29 which has a radius equalto the distance 'a release button 31 for a safety switch unit 215 isspaced from the stem axis. The button 31 is mounted on a housing 33which also supports a re-set button 3S for the unit 25 which iscircuit-connected in a manner to be hereinafter described.

The hollow base 12 functions as a housing for a valve assembly 311 (FIG.8) which includes a solenoid 32a mounted in a casing 32 and a valve body34 actuated in response to energization of the solenoid 32a. Astationary valve passage member '36 connected to a supply line 3S forair under pressure is` formed with substantially parallel air passages41B, 42, 44, 416 and 4S for a purpose to appear presently.

Mounted for up and down reciprocation in the cylinder 14 is a hollowpiston member 50 which has a tubular central portion 52 arranged for upand down sliding movement on an upright piston member 54 secured to andextending downwardly from the lower wall 56 for the reservoir member 16.The lower wall 51 for the piston Si) closes the lower end of the tubularportion 52 so as to form a iluid chamber 53 in the tubular portionbetween the lower end of the piston 54 and the lower wall 51 of thepiston Stl.

The valve body 34 is movable between a first spr-ingurged position `anda second solenoid-moved position when the solenoid 32a is energized. Thepassage 40 in the valve passage member 36 rconnects the valve body 34with the air inlet line 38 in both the positions of the body 34. In thespring-urged position of the body 34, the passage 44 communicates, byway of the body 34, with the air inlet passage 49 and, through a passage53 (FIG. 4) rin the walls of the cylinder member 14 and the reservoir'member 16, with the interior of the cylinder member 14 on the top sideof the piston Sii. ln this position of the body 34, the passage 46,which is connected to an outlet passage 47 in the cylinder wall,communicates with the cylinder 14 below the piston 50, and the passages42 and 4S are closed at the body 34. The piston 50` is thus moveddownwardly in the cylinder 14. In the solenoid actuated position of thebody 34 the passages 44 and 46 are closed, the passage 42 communicateswith the passage 58 and with `anexhaust passage y49 in the cylinderwall, and the passage 48 is connected Ithrough the body 34 with thesupply passage 40 for supplying air under pressure to the cylinder 14below the piston 50, so that the piston 51B is moved upwardly in thecylinder 14.

The chamber S3 and communicating fluid passages are filled with ahydraulic huid so that when air is supplied to the cylinder 14 below thepiston bottom wall 51 and the piston member 5@ moves upwardly in thecylinder 14, fluid is forced out of the chamber 53 through an uprightpassage 60 in the fixed piston 54, through a horizontal passage 6-2 linthe reservoir `lower wall 56 to a flexible high pressure conduit 64 onthe reservoir member 16. The member 64 communicates with a driving toolsuch as those .shown in FGS. l2-l5, inclusive, to be operated by thepower unit 10.

When the circuit for the solenoid 32a is opened so that air underpressure is supplied to the cylinder member 14 on the top side of thepiston Si); the piston member is forced downwardly in the cylinder 14 sothat fluid in an annular chamber 66 which surrounds the piston member 50is forced out of the chamber 66 through a horizontal passage 68 in thecylinder wall into a liexible conduit member 70 which also communicates`with the driving tool. As shown in FIG. 1, the piston member 50 has anupper portion 72 and a lower portion 74 of a reduced diameter relativeto the portion 72 with a horizontal shoulder 76 being formed at thejuncture of the portions. The cylinder 14 has corresponding reduced andenlarged bore sections 78 and S1 for slidably supporting the pistonsections 72 and 74. On downward movement of the piston member 50, theupper enlarged portion '72 thereof acts to displace fluid in the annularchamber 66 tofraise the pressure of the fluid and force it out of thechamber 66 and the conduit member 701.

It can thus be seen that in the solenoid-moved position of the vaivebody 34, air under pressure is supplied to the lbottom side of thepiston 50 and exhausted from the top side so as to force fluid underpressure into the conduit member 64. By virtue of the relative areas ofthe lower ends of the piston members 50i and 54, fluid is delivered tothe conduit 64 at a substantial pressure. When the valve body 34 isreturned to its spring-urged position, air under pressure is supplied tothe top side of the piston 50 and exhausted from the bottom side. Thepiston 50 is thus moved downwardly to force iiuid under pressure throughthe conduit member 70. This pressure in the conduit member 70 is reducedrelative to the pressure in the conduit 64.

The higher pressure Huid in the conduit member 64 is used to move thepiston in the driving tool in a direction to drive the fastener, as willbe described in detail hereinafter. Fluid from the conduit member 70Areturns the tool piston to a set position for the next drivingoperation.

A pair of driving tools 150 and 200 are shown in FIGS. 12 and 14,respectively, that are adapted to be used with the power unit 10. Sincethe tools 150` and 200 are conventional in the sense that they includethe usual anvil, collet, and mechanical structure for moving these partsrelative to each other, only the hydraulic mechanism and the controlswitches will be described in detail hereinafter. The tool includes abody 152 having a cylinder portion 154 in which a piston 156 is slidablymounted.

A pair of fluid passages 158 and 1611` in the valve body 152 communicatewith the cylinder 154 on what for convenience of description will bereferred to as the bottom side `162 and top side 164, respectively, ofthe piston 156. The flexible conduits 64 and 7@ are connected to thebody 152 so that they communicate with the passages 15S and 160,respectively. As a result, when the piston St is moved upwardly to forceuid under pressure out of the unit 111 through the conduit member `64,this liuid is delivered to the cylinder 154 so as to exert an upwardforce on the piston 156 and in turn operate the tool 151? to drive thefastener to which the tool is applied.

A tubular member 166 carried by the piston 156 moves upwardly along withthe piston. The tubular member 166 carries a radially inwardlyprojecting pin 170 which rides in a groove 174 formed in a switchactuating rod 172 that is slidably supported in the tubular member 166.When the piston 156 has traveled upwardly a distance necessary to movethe pin 170 to the upper end of the groove 174, further upward movementof the piston causes upward movement of the rod 172l to open a switch136 connected to the lower end of the rod. As shown in FIG. ll, theswitch 136 is connected in a circuit indicated generally at 130 whichincludes the usual leads L1 and L2, the solenoid 32a, the reservoirsafety switch 25, and a switch 134 operated by a trigger `180 on thetool 150.

In a fastener driving operation, the operator actuates the trigger 18dto close the trigger switch 134 and energize the solenoid 32a which inturn acts to move the valve body 34 as previously described so that theunit 10 operates to move the tool piston 156 in a driving direction. Atthe completion of the driving stroke of the piston 156, the switch 136is opened by the actuating rod 172 so that the solenoid 32a isautomatically de-energized. The valve body 34 returns and the power unity10 operates to force iiuid under pressure through the conduit 70 andpiston 50 to return the tool piston '156 to a position in readiness fora subsequent gun operation. The trigger is of course released by theoperator when the switch 136 is opened since it is apparent that themovement of the tool 150 to drive a fastener has been completed. Returnof the piston 156 to a position against the cylinder bottom wall 182moves the pin 170 against the rod 172 at the lower end of the groove 174and moves the rod 172 downwardly to again close the switch 136.

The driving tool 20? likewise includes a body 202 having a cylinderportion 2114 in which a piston 206 is mounted for reciprocal movement.Passages 208 and 21u in the tool handle 2119 communicate through otherpassages 211 and 213, respectively, with opposite ends of the cylinder204 and are connected to the conduits 64 and 7 il, respectively.

The piston 206 has a forwardly projecting extension 240 arrangedconcentrically within an annular seal 242 mounted in the body 292. Anannular slideway 244 for the tubular inner end portion 24o of a pintailejecting plunger 248 is formed in the extension 240` by inserting asmaller hollow cylinder 251Bv in an elongated opening in the extension246/. The plunger 248 is part of a nose attachment, indicated generallyat 252, removably mounted on the tool 21N? for setting fasteners andrivets of the type having a pull pin. The nose attachment 252 includes abarrel 254 having a radially extending ear 256 positioned in a groove25S in the body 202.

A spring 260 in the cylinder 25u engages the plunger 248 at the forwardend of the tubular portion 246 and urges the plunger 248 in a directionoutwardly of the tool to a stop position in which a shoulder 262 on theplunger engages a shoulder 264 on a tubular slide support 256 for theplunger 248. The slide support 266 is positioned within an actuatingsleeve 268 having a tapered annular surface 270 at its forward or outerend which engages a similar surface 272 on an expandable andcontractible annular jaw assembly 274. A ring 278 support-s the outerend of the slide support 266 and engages the inner end of the jawassembly 274. A spring 280 extends between the ring 278 and annular ears282 on the inner end of the slide support 266 and urges the jaw assembly274 axially outwardly of the sleeve 268 to maintain the inclinedsurfaces 270 and 272 in engagement. A retainer ring 284 in a groove 286formed in the inner surface of the `sleeve 268 maintains the jawassembly 274, the ring 278 and its associated spring '280, and the slidesupport 266 in an assembled position within the sleeve 268 so that allof these parts can be handled as a unit when the nose assembly 252 isdetached from the tool body 202.

The barrel 254 has a detachable anvil 290' at its forward or outer endwhich is replaceable when it becomes worn or damaged. The anvil 290 hasa longitudinally extending flange 292 at its rear end which ts about thebarrel 254 and a shoulder 294 which abuts the outer end of the barrel254. The ange 292 is radially offset from the anvil 290 so as to form ashoulder 296 which extends radially outwardly from the outer surface ofthe anvil 290 for a purpose to appear presently. Longitudinallyextending ears 298 on the outer end of the barrel 254 fit in slots 300in the anvil 290 in `a position of the barrel within the anvil flange292. The ears 300 terminate at their outer ends in radially outwardlyextending projections 302. To retain the anvil '290 on the barrel 254, aremovable retaining ring 304 is extended about the anvil 290 between theshoulder 296 on the anvil and the projections 302 on the barrel. Toremove the anvil 290 for replacement, it is only necessary to remove thering 302 and withdraw the anvil from the barrel.

In the assembly of the nose attachment 252 and the tool -body 202, theinner end of the actuating sleeve 266 is threaded onto an outer endportion 306 of the piston extension 240. The barrel 254 is extended intothe tool body 202 to a position against the outer end of the seal 242with the ear 256 on the barrel located in a slot 308 in the lower sideof the barrel 254. On rotation of the barrel, the retaining ear 256slides into the groove 258, which terminates at its ends at the slot308, and prevents the barrel from being removed from the body 202. Aspring-pressed pin 310 has an enlarged head 312 which engages a pin 314extending across the slot 308 at a position radially outwardly of theear 256 to position the head 312 at the ends of the groove 253 and inthe path of the ear 256 so that the ear cannot be accidentallypositioned in the slot 308 to permit removal of the barrel 254. In orderto remove the nose attachment 252, it is necessary to rst manuallydepress the pin 310 to a position in which the head 312 is out of thepath of movement of the ear 256.

v In the operation of the tool 200, when fluid under pressure isdelivered through the conduit 64 to the passage 208, the piston 206 ismoved rearwardly toward a cylinder end Wall 212 which carries a pin 214projected toward a ball member 216 carried on the piston 206. A spring218 urges the ball member 216 to a seated position at one end of anaxial uid passage 220 in the piston 206. The passage 220 communicateswith the passage 208 through inclined piston passages 222 when the ball216 is moved ofi` its seat against the pressure of the spring 218. As -aresult, when the piston 206 has been moved to a position in which thepin 214 unseats the ball 216, the driving operation of the tool iscompleted because fluid from the conduit member 208 is merely dumpedthrough the piston passages 220 and 222 into the passage 210 for returnto the-power unit 10. The operator then releases the tool trigger 230,which Vactuates a switch like the switch 134 connected in series withthe solenoid 32a, so that the switch is opened and the solenoid 32a isde-energized and the power unit 10 is operated to force uid underpressure through the con- 6 duit '70. In the event the full stroke ofthe piston 206 is not required to set the fastener, the trigger 230 isof course released as soon as the fastener is set.

Prior to actuation of the trigger 230, the nose attachment 252 isassembled with a fastener to be applied in the usual manner so that thefastener stem or pin extends axially through the contractible jawassembly 274 and the ejector plunger 248 is forced inwardly to compressthe spring 260. The sleeve 268 and the jaw assembly 274 cooperate in themanner described in Patent No. 2,114,493 to effect first a gripping andthen a pulling of the fastener pin `as the piston 206 travels toward thecylinder wall 212. The reaction to the pulling force exerted on thefastener pin is applied through the anvil 290 to the fastener collar orsleeve. When the pin is fractured, the plunger '248 ejects the pintailand the piston 206 moves the jaw assembly 274 and the sleeve 268 topositions in readiness for the next fastener setting operation. A spacerring 320 on the outer end of the sleeve 26S prevents the jaw assembly274 from being contracted on the plunger 24S.

In the tool 200, the piston actuated switch 136 required in the tool 150is dispensed with and the tool 200 utilizes instead the ball valve 216in the piston 206.

The chamber (FIG. l) formed in the reservoir member 16 between thediaphragm 18 and the bottom wall 56 is iilled with uid. A chamber 32formed between the cover 20 and the top side of the diaphragm 18communicates through a horizontal passage 84 in the cover member 20 withan upright passage 86 extended through the walls of the cylinder member14 and the reservoir member 16 and communicating at its lower end withthe air inlet line 38. Consequently, the diaphragm 10 is subjected to arelatively constant air pressure which provides for 'a predeterminedpressure of the diaphragm 18 on the iluid in the chamber 80 so as tolikewise maintain this fluid at a predetermined constant pressure.

The chamber 80 communicates with the horizontal passage 62 in thereservoir member 16 through a pair of upright passages 83 and 90 and ahorizontal passage 89 in an enlarged outer portion 92 of the reservoirlower wall 56. The passage 39 is aligned with an enlarged horizontalcavity in the reservoir in which a check valve unit 94 of conventionalconstruction is disposed. The unit 94 includes a valve body 98 which isnormally held against a seat 10S in the passage 09. When the pressure inthe passage is above a predetermined limit the body 90 moves inwardly toadmit iluid from the passage 89 to the passage 88 and thence into thechamber S0. This flow continues until the pressure in the passage 89 hasbeen reduced to a lower limit.

It is seen, therefore, that in the event uid in the passage 90, which inturn communicates with fluid in the chamber 53, is raised above apredetermined pressure, the one-way check valve unit 94 acts to providefor a flow of fluid into the chamber 80 which expands to accommodatethis extra uid and relieves the pressure in the charnber 53 andcommunicating Huid passages.

Conversely, in the event the total fluid volume in the chamber 53 andthe communicating fluid passages which deliver high pressure fluid tothe tool piston is reduced, the pressure of this fluid on a second checkvalve unit 112 (FIG. l0) mounted on the reservoir member 16 is reducedwhen the piston 50 is in the position shown in FIG. l. The pressure ofthe fluid in the chamber 80 which is substantially constant acts on avalve body for the oneway check valve 112 to move the body 110 inwardlywhen the pressure is reduced in the chamber 53 to provide for a ow offluid through an upright passage 111 and a horizontal passage 109 in thereservoir lower wall 56 to an upright passage 113 in the fixed piston54. The passage 113 communicates at its lower end with the chamber 53.The chamber 80 and the check valve unit 112 thus act to continuallyprovide make-up fluid to the chamber 53 to provide for a volume make-upand for a minimum pres- 7 sure therein for operating the driving tool15) or Edil.

A similar pair of check Valve units 114 and 116 (FlGS. and 9) areinstalled in the reservoir wall portion 92 and communicate throughpassages 115 and 117, respectively, with the chamber 66 to provide for apressure relief and a volume make-up, respectively, for the annularchamber 66. 'I'he chamber t) thus constitutes a fluid source formaintaining a constant volume of operating fluid in the power -unit andthe tool 150 or 200 connected thereto. The chamber dll also acts toaccommodate extra Huid in the event the pressure in either of thechambers 53 or 66 becomes excessive. The check valve units 94, and 114are adjustable to determine the pressures at which the valve units willopen to provide the desired pressure relief, and the valve units 112 and116 are likewise adjustable to determine the lower pressure limits inthe chambers 53 and 66.

As fluid is moved out ofthe chamber 80, the diaphragm moves toward thereservoir bottom wall 56. The stem 23 and the collar flange 29 arecorrespondingly moved toward the cover until the ilange 29 engages theswitch release button 31 and opens the switch 25. The chamber 80 mustthen be re-lled and the switch reset with the button 35 before the powerunit 10 can be operated.

`From the above description it can be seen that when the power unit 1t)is used, the fastener applying tool, such as one of the toolsillustrated, is of a simplified construction without bulky and heavyvalve mechanisms. Furthermore, the unit 10 provides for a continuedsupply of the necessary high pressure lluid to the driving tool whileminimizing the danger of uid leakage.

It will be understood that the specific construction of the improvedpower unit which is herein disclosed and described is presented forpurposes of explanation and illustration and is not intended to indicatelimits of the invention, the scope of which is delined by the followingclaims.

What is claimed is:

1. In a fastener applying mechanism which includes a tool having acylinder portion and a piston mounted in the cylinder portion formovement in one direction toward one position to operate the tool and inan opposite direction to an opposite position for the next fastenerapplying operation, and a remote power unit for supplying fluid underpressure to said cylinder portion for moving the piston in said oppositedirections, valve means on said power unit movable between a rstposition in which fluid is supplied from the power unit to said cylinderportion for moving the piston in said one direction and a secondposition in which fluid is supplied to said cylinder portion for movingthe piston in said opposite direction, solenoid means for controllingthe position of said valve means, and manually operable trigger switchmeans on said tool electrically connected with said solenoid means forselectively controlling the actuation of said solenoid means, and meansdisposed on the tool and operatively associated with the pistonindependently of said trigger switch means for relieving the fluidpressure from one side of the piston responsively to the piston reachingone of said one position and said opposite position.

2. In a fastener applying mechanism which includes a tool having acylinder portion and a piston mounted in the `cylinder portion formovement in one direction to operate the tool and in an oppositedirection to a set position for the next fastener applying operation,and a rcrnote power unit for supplying iluid under pressure to saidcylinder portion for moving the piston in said opposite directions,valve means on said power unit movable between a rst position in whichfluid is supplied from the power unit to said cylinder portion formoving the piston in said one direction and a second position in whichfluid is supplied to said cylinder portion for moving the piston in said.opposite direction, solenoid means for controlling the position of saidvalve means, manually operable trigger switch means on said toolelectrically connected with said solenoid means for selectivelycontrolling the actuation of said solenoid means, normally closed dswitch means on said tool connected to said piston for movement to anopen position in response to completed movement of said piston in saidone direction and electrically connected to said solenoid means and tosaid trigger switch means for controlling the actuation of said solenoidmeans independently of said trigger switch means.

3. In a fastener applying mechanism which includes a tool having acylinder portion and a piston mounted in the cylinder portion formovement in one direction to operate the tool and in an oppositedirection to a set position for the next fastener applying operation,and a remote power unit for supplying lluid under pressure to saidcylinder portion for moving the piston in said opposite directions,valve means on said power unit movable between a first position in whichfluid is supplied from the power unit to said cylinder portion formoving the piston in said one direction and a second position in whichtluid is supplied to said cylinder portion for moving the piston in saidopposite direction, solenoid means for controlling the position of saidvalve means, manually operable trigger switch means on said toolelectrically connected with said solenoid means for selectivelycontrolling the actuation of said solenoid means, and normally closedvalve means responsively to the said tool movable to an open position oncompletion of said movement of the piston in said one direction forfluid communicating opposite sides of said piston.

4. A fastener applying mechanism comprising a tool having a cylinderportion and a piston mounted for reciprocal movement in said cylinderportion between limit positions adjacent opposite ends of said cylinderportion, switch means mounted on said tool for controlling the actuationof the movement of said piston to said limit positions, said switchmeans including trigger switch means selectively operable for`controlling the actuation of said piston for movement to one of saidlimit positions, said switch means further including control switchmeans mounted on said tool for controlling actuation of said movement ofsaid piston to the other of said limit positions, and means responsivein operation to movement of said piston to said one of said limitpositions for substantially instantaneously actuating said switch means.

5. A fastener applying mechanism comprising a tool having a cylinderportion and a piston mounted for reciprocal movement in said cylinderportion between limit positions adjacent opposite ends of said cylinderportion, switch means mounted on said tool for controlling the actuationof the movement of said piston to said limit positions, said switchmeans including trigger switch means selectively operable forcontrolling the actuation of said piston for movement to one of saidlimit positions, said switch means further including control switchmeans mounted on said tool for controlling actuation of said movement ofsaid piston to the other of said limit positions, and lost motion meansconnecting said piston and said switch means so that the switch means issubstantially instantaneously actuated when said piston moves to saidone of said limit positions.

6. A fastener applying mechanism comprising a tool having a cylinderportion and a piston mounted for reciprocal movement in said cylinderportion between limit positions adjacent opposite ends of said cylinderportion, switch means mounted on said tool for controlling the actuationof the movement of said piston, and valve means on said piston movableto an open position in response f to movement of said piston to one ofsaid limit positions for lluid communicating opposite sides of thepiston.

7. A fastener applying mechanism comprising a tool having a cylinderportion, a piston member mounted for reciprocal movement in saidcylinder portion, and duid conduits adapted to Ibe supplied with fluidunder pressure for delivering the liuid to said Kcylinder portion on oneside of said piston member `for moving said piston member in onedirection to operate said tool to apply a fastener and on the oppositeside of said piston member for moving said piston member in a returndirection, normally closed valve means in said piston member operable inan open position to iiuid communicate the portions of said cylinderportion on opposite sides of said piston, and means on said tool forOpening said valve means when said piston member has moved apredetermined distance in said one direction.

8. A fastener applying mechanism comprising a tool having a cylinderportion, a piston member mounted for reciprocal movement in saidcylinder portion, and tluid conduits adapted to be supplied with fluidunder pressure for delivering said iluid to the cylinder portion on oneside of said piston member `for moving said piston member in onedirection to operate said tool to apply a fastener and on said oppositeside of said piston member for moving the piston member in a returndirection, normally closed valve means in said piston member operable inan open position to fluid communicate the portions of said cylinderportion on opposite sides of said piston, said valve means including apassage formed in said piston member, a ball member mounted on saidpiston member for movement to a seated position closing said passage,means resiliently urging said ball member to said seated position, andmeans on said tool engageable with said ball member for moving said ballmember away from said seated position against the pressure of saidurging means when said piston member has moved a predetermined distancein said one direction.

9. A fastener applying mechanism -operable with a source of fluid underpressure comprising a tool having a cylinder portion, a piston membermounted for reciprocal movement in said cylinder portion, and uidconduits adapted to be supplied with tiuid under pressure for deliveringthe Huid to said cylinder portion on lone side of said piston member formoving said piston member in one direction to operate said tool to applya `fastener and on the opposite side of said piston member for movingsaid piston member in a return direction, normally closed valve means onsaid piston member operable in an open position to fluid communicate theportions of said cylinder portion on opposite sides of said piston,means on said tool for opening said valve means when said piston memberhas moved a predetermined distance in said one direction, and meansincluding `a manually operable switch on said tool for providing asupply of fluid under pressure from the source to said cylinder portionon lone side of said piston member when said switch is in a iclosedposition and for providing a `supply of uid under pressure from thesource to the opposite side of said piston member when said switch is inan open position.

10. A fastener applying mechanism comprising a tool having a cylinderportion and a piston mounted for reciprocal movement in said cylinderportion between limit positions adjacent opposite ends of said cylinderportion, switch means for controlling the actuation of the movement ofsaid piston to said limit positions, said switch means including triggerswitch means selectively operable to control actuation of the movementof said piston to one of said limit positions, said switch means furtherincluding control switch means mounted Von `said tool for, uponactuation, deactuating said trigger switch means and for controlling theactuation of the movement of said piston to the other of said limitpositions, and means responsive in operation to movement of said pistonto said one of said limit positions for substantially instantaneouslyactuating said control switch means.

l1. A fastener applying mechanism comprising a tool having a cylinderportion and a piston mounted for reciprocal movement in said cylinderportion between limit positions adjacent opposite ends of said cylinderportion, switch means for controlling the actuation of the movement ofsaid piston to said limit positions, said switch means including triggerswitch means selectively actuable to control, upon actuation, theactuation of the movement of said piston to one of said limit posi-tionsand, upon deactuation, the movement of said piston to the other of saidlimit positions, said switch means further including control switchmeans mounted on said tool for, upon actuation, deactuating said triggerswitch means and for controlling the actuation of the movement of saidpiston to the other of said limit positions, and means responsive inoperation to movement of said piston to said one of said limit positionsfor substantially instantaneously actuating said control switch means.

12. The mechanism of claim 11 further including means responsive inoperation to movement of said piston to said other of said limitpositions tor deactua-ting said control switch means.

13. A fastener applying mechanism comprising a tool having a cylinderportion and a piston mounted for reciprocal movement in said cylinderportion between limit positions adjacent opposite ends of said cylinderportion, switch means for `controlling the actuation of the movement ofsaid pi-ston to said limit positions, said switch means including anormally opened trigger switch selectively operable to control, uponbeing closed, the actuation of the movement of said piston to one ofsaid limit positions and upon being opened, the movement of said pistonto the other of said limit positions, said switch means furtherincluding a normally closed control switch mounted on said tool fordeactuating said trigger switch means upon being opened and forcontrolling the actuation of the movement of said piston to the other ofsaid limit positions, and mean-s responsive in operation to movement ofsaid piston to said one oti said limit positions for substantiallyinstantaneously opening said control switch and responsive in operationto movement of said piston to said other of said limit positions forsubstantially instantaneously closing said control switch.

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UNITED STATES vPATENT OFFICE CERTIFICATE OF CORRECTION September 4, 1962George J., Van Hecke It is hereby certified that err-or appears in theabove numbered patent requiring correction and that the said LettersPatent should read as corrected below.

line line read (SEAL) Attest:

Column 8, line 24', for "responsvely to the" read on 25, for nom" readresponsively to the column 9, l1, for "said" read the same line Il, for"the" Vsigned and sealed this 27th day of August 1963.

DAVID L. LADD ERNEST W SWIDER Attesting Officer Commissioner of Patents

